Gurobi 5.0.1 (linux64) logging started Wed Apr 24 02:12:08 2013

Optimize a model with 48369 rows, 47679 columns and 190509 nonzeros
Presolve removed 687 rows and 0 columns
Presolve time: 0.29s
Presolved: 47682 rows, 47679 columns, 189135 nonzeros
Variable types: 47610 continuous, 69 integer (69 binary)

Root relaxation: objective 6.416859e+04, 7851 iterations, 1.22 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0 64168.5924    0    2          - 64168.5924     -      -    1s
H    0     0                    64266.000000 64168.5924  0.15%     -    1s
     0     0 64169.2052    0    3 64266.0000 64169.2052  0.15%     -    2s
     0     0 64169.2052    0    2 64266.0000 64169.2052  0.15%     -    3s
     0     0 64169.2052    0    3 64266.0000 64169.2052  0.15%     -    3s
     0     0 64169.2253    0    3 64266.0000 64169.2253  0.15%     -    3s
     0     0 64169.2253    0    3 64266.0000 64169.2253  0.15%     -    3s
     0     0 64169.2253    0    3 64266.0000 64169.2253  0.15%     -    3s
     0     0 64175.7170    0    1 64266.0000 64175.7170  0.14%     -    3s
     0     2 64197.0000    0    1 64266.0000 64197.0000  0.11%     -    3s

Cutting planes:
  Flow cover: 2

Explored 3 nodes (10421 simplex iterations) in 3.85 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 6.426600000000e+04, best bound 6.426600000000e+04, gap 0.0%